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wireprotov2: implement commands as a generator of objects...
wireprotov2: implement commands as a generator of objects Previously, wire protocol version 2 inherited version 1's model of having separate types to represent the results of different wire protocol commands. As I implemented more powerful commands in future commits, I found I was using a common pattern of returning a special type to hold a generator. This meant the command function required a closure to do most of the work. That made logic flow more difficult to follow. I also noticed that many commands were effectively a sequence of objects to be CBOR encoded. I think it makes sense to define version 2 commands as generators. This way, commands can simply emit the data structures they wish to send to the client. This eliminates the need for a closure in command functions and removes encoding from the bodies of commands. As part of this commit, the handling of response objects has been moved into the serverreactor class. This puts the reactor in the driver's seat with regards to CBOR encoding and error handling. Having error handling in the function that emits frames is particularly important because exceptions in that function can lead to things getting in a bad state: I'm fairly certain that uncaught exceptions in the frame generator were causing deadlocks. I also introduced a dedicated error type for explicit error reporting in command handlers. This will be used in subsequent commits. There's still a bit of work to be done here, especially around formalizing the error handling "protocol." I've added yet another TODO to track this so we don't forget. Test output changed because we're using generators and no longer know we are at the end of the data until we hit the end of the generator. This means we can't emit the end-of-stream flag until we've exhausted the generator. Hence the introduction of 0-sized end-of-stream frames. Differential Revision: https://phab.mercurial-scm.org/D4472
Martin von Zweigbergk - - Load All Authors

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test-rename.t
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$ hg init
$ mkdir d1 d1/d11 d2
$ echo d1/a > d1/a
$ echo d1/ba > d1/ba
$ echo d1/a1 > d1/d11/a1
$ echo d1/b > d1/b
$ echo d2/b > d2/b
$ hg add d1/a d1/b d1/ba d1/d11/a1 d2/b
$ hg commit -m "1"
rename a single file
$ hg rename d1/d11/a1 d2/c
$ hg --config ui.portablefilenames=abort rename d1/a d1/con.xml
abort: filename contains 'con', which is reserved on Windows: d1/con.xml
[255]
$ hg sum
parent: 0:9b4b6e7b2c26 tip
1
branch: default
commit: 1 renamed
update: (current)
phases: 1 draft
$ hg status -C
A d2/c
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/c
rename a single file using absolute paths
$ hg rename `pwd`/d1/d11/a1 `pwd`/d2/c
$ hg status -C
A d2/c
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/c
rename --after a single file
$ mv d1/d11/a1 d2/c
$ hg rename --after d1/d11/a1 d2/c
$ hg status -C
A d2/c
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/c
rename --after a single file when src and tgt already tracked
$ mv d1/d11/a1 d2/c
$ hg addrem -s 0
removing d1/d11/a1
adding d2/c
$ hg rename --after d1/d11/a1 d2/c
$ hg status -C
A d2/c
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/c
rename --after a single file to a nonexistent target filename
$ hg rename --after d1/a dummy
d1/a: not recording move - dummy does not exist
[1]
move a single file to an existing directory
$ hg rename d1/d11/a1 d2
$ hg status -C
A d2/a1
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/a1
move --after a single file to an existing directory
$ mv d1/d11/a1 d2
$ hg rename --after d1/d11/a1 d2
$ hg status -C
A d2/a1
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/a1
rename a file using a relative path
$ (cd d1/d11; hg rename ../../d2/b e)
$ hg status -C
A d1/d11/e
d2/b
R d2/b
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/d11/e
rename --after a file using a relative path
$ (cd d1/d11; mv ../../d2/b e; hg rename --after ../../d2/b e)
$ hg status -C
A d1/d11/e
d2/b
R d2/b
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/d11/e
rename directory d1 as d3
$ hg rename d1/ d3
moving d1/a to d3/a
moving d1/b to d3/b
moving d1/ba to d3/ba
moving d1/d11/a1 to d3/d11/a1
$ hg status -C
A d3/a
d1/a
A d3/b
d1/b
A d3/ba
d1/ba
A d3/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
rename --after directory d1 as d3
$ mv d1 d3
$ hg rename --after d1 d3
moving d1/a to d3/a
moving d1/b to d3/b
moving d1/ba to d3/ba
moving d1/d11/a1 to d3/d11/a1
$ hg status -C
A d3/a
d1/a
A d3/b
d1/b
A d3/ba
d1/ba
A d3/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
move a directory using a relative path
$ (cd d2; mkdir d3; hg rename ../d1/d11 d3)
moving ../d1/d11/a1 to d3/d11/a1
$ hg status -C
A d2/d3/d11/a1
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d2/d3
move --after a directory using a relative path
$ (cd d2; mkdir d3; mv ../d1/d11 d3; hg rename --after ../d1/d11 d3)
moving ../d1/d11/a1 to d3/d11/a1
$ hg status -C
A d2/d3/d11/a1
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d2/d3
move directory d1/d11 to an existing directory d2 (removes empty d1)
$ hg rename d1/d11/ d2
moving d1/d11/a1 to d2/d11/a1
$ hg status -C
A d2/d11/a1
d1/d11/a1
R d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d2/d11
move directories d1 and d2 to a new directory d3
$ mkdir d3
$ hg rename d1 d2 d3
moving d1/a to d3/d1/a
moving d1/b to d3/d1/b
moving d1/ba to d3/d1/ba
moving d1/d11/a1 to d3/d1/d11/a1
moving d2/b to d3/d2/b
$ hg status -C
A d3/d1/a
d1/a
A d3/d1/b
d1/b
A d3/d1/ba
d1/ba
A d3/d1/d11/a1
d1/d11/a1
A d3/d2/b
d2/b
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
R d2/b
$ hg update -C
5 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
move --after directories d1 and d2 to a new directory d3
$ mkdir d3
$ mv d1 d2 d3
$ hg rename --after d1 d2 d3
moving d1/a to d3/d1/a
moving d1/b to d3/d1/b
moving d1/ba to d3/d1/ba
moving d1/d11/a1 to d3/d1/d11/a1
moving d2/b to d3/d2/b
$ hg status -C
A d3/d1/a
d1/a
A d3/d1/b
d1/b
A d3/d1/ba
d1/ba
A d3/d1/d11/a1
d1/d11/a1
A d3/d2/b
d2/b
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
R d2/b
$ hg update -C
5 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
move everything under directory d1 to existing directory d2, do not
overwrite existing files (d2/b)
$ hg rename d1/* d2
d2/b: not overwriting - file already committed
('hg rename --force' to replace the file by recording a rename)
moving d1/d11/a1 to d2/d11/a1
[1]
$ hg status -C
A d2/a
d1/a
A d2/ba
d1/ba
A d2/d11/a1
d1/d11/a1
R d1/a
R d1/ba
R d1/d11/a1
$ diff -u d1/b d2/b
--- d1/b * (glob)
+++ d2/b * (glob)
@@ * (glob)
-d1/b
+d2/b
[1]
$ hg update -C
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d2/a d2/ba d2/d11/a1
attempt to move one file into a non-existent directory
$ hg rename d1/a dx/
abort: destination dx/ is not a directory
[255]
$ hg status -C
$ hg update -C
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
attempt to move potentially more than one file into a non-existent directory
$ hg rename 'glob:d1/**' dx
abort: with multiple sources, destination must be an existing directory
[255]
move every file under d1 to d2/d21
$ mkdir d2/d21
$ hg rename 'glob:d1/**' d2/d21
moving d1/a to d2/d21/a
moving d1/b to d2/d21/b
moving d1/ba to d2/d21/ba
moving d1/d11/a1 to d2/d21/a1
$ hg status -C
A d2/d21/a
d1/a
A d2/d21/a1
d1/d11/a1
A d2/d21/b
d1/b
A d2/d21/ba
d1/ba
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d2/d21
move --after some files under d1 to d2/d21
$ mkdir d2/d21
$ mv d1/a d1/d11/a1 d2/d21
$ hg rename --after 'glob:d1/**' d2/d21
moving d1/a to d2/d21/a
d1/b: not recording move - d2/d21/b does not exist
d1/ba: not recording move - d2/d21/ba does not exist
moving d1/d11/a1 to d2/d21/a1
[1]
$ hg status -C
A d2/d21/a
d1/a
A d2/d21/a1
d1/d11/a1
R d1/a
R d1/d11/a1
$ hg update -C
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d2/d21
move every file under d1 starting with an 'a' to d2/d21 (regexp)
$ mkdir d2/d21
$ hg rename 're:d1/([^a][^/]*/)*a.*' d2/d21
moving d1/a to d2/d21/a
moving d1/d11/a1 to d2/d21/a1
$ hg status -C
A d2/d21/a
d1/a
A d2/d21/a1
d1/d11/a1
R d1/a
R d1/d11/a1
$ hg update -C
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d2/d21
attempt to overwrite an existing file
$ echo "ca" > d1/ca
$ hg rename d1/ba d1/ca
d1/ca: not overwriting - file exists
('hg rename --after' to record the rename)
[1]
$ hg status -C
? d1/ca
$ hg update -C
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
forced overwrite of an existing file
$ echo "ca" > d1/ca
$ hg rename --force d1/ba d1/ca
$ hg status -C
A d1/ca
d1/ba
R d1/ba
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/ca
attempt to overwrite an existing broken symlink
#if symlink
$ ln -s ba d1/ca
$ hg rename --traceback d1/ba d1/ca
d1/ca: not overwriting - file exists
('hg rename --after' to record the rename)
[1]
$ hg status -C
? d1/ca
$ hg update -C
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/ca
replace a symlink with a file
$ ln -s ba d1/ca
$ hg rename --force d1/ba d1/ca
$ hg status -C
A d1/ca
d1/ba
R d1/ba
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/ca
#endif
do not copy more than one source file to the same destination file
$ mkdir d3
$ hg rename d1/* d2/* d3
moving d1/d11/a1 to d3/d11/a1
d3/b: not overwriting - d2/b collides with d1/b
[1]
$ hg status -C
A d3/a
d1/a
A d3/b
d1/b
A d3/ba
d1/ba
A d3/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
move a whole subtree with "hg rename ."
$ mkdir d3
$ (cd d1; hg rename . ../d3)
moving a to ../d3/d1/a
moving b to ../d3/d1/b
moving ba to ../d3/d1/ba
moving d11/a1 to ../d3/d1/d11/a1
$ hg status -C
A d3/d1/a
d1/a
A d3/d1/b
d1/b
A d3/d1/ba
d1/ba
A d3/d1/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
move a whole subtree with "hg rename --after ."
$ mkdir d3
$ mv d1/* d3
$ (cd d1; hg rename --after . ../d3)
moving a to ../d3/a
moving b to ../d3/b
moving ba to ../d3/ba
moving d11/a1 to ../d3/d11/a1
$ hg status -C
A d3/a
d1/a
A d3/b
d1/b
A d3/ba
d1/ba
A d3/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
move the parent tree with "hg rename .."
$ (cd d1/d11; hg rename .. ../../d3)
moving ../a to ../../d3/a
moving ../b to ../../d3/b
moving ../ba to ../../d3/ba
moving a1 to ../../d3/d11/a1
$ hg status -C
A d3/a
d1/a
A d3/b
d1/b
A d3/ba
d1/ba
A d3/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
skip removed files
$ hg remove d1/b
$ hg rename d1 d3
moving d1/a to d3/a
moving d1/ba to d3/ba
moving d1/d11/a1 to d3/d11/a1
$ hg status -C
A d3/a
d1/a
A d3/ba
d1/ba
A d3/d11/a1
d1/d11/a1
R d1/a
R d1/b
R d1/ba
R d1/d11/a1
$ hg update -C
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rf d3
transitive rename
$ hg rename d1/b d1/bb
$ hg rename d1/bb d1/bc
$ hg status -C
A d1/bc
d1/b
R d1/b
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/bc
transitive rename --after
$ hg rename d1/b d1/bb
$ mv d1/bb d1/bc
$ hg rename --after d1/bb d1/bc
$ hg status -C
A d1/bc
d1/b
R d1/b
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/bc
$ echo "# idempotent renames (d1/b -> d1/bb followed by d1/bb -> d1/b)"
# idempotent renames (d1/b -> d1/bb followed by d1/bb -> d1/b)
$ hg rename d1/b d1/bb
$ echo "some stuff added to d1/bb" >> d1/bb
$ hg rename d1/bb d1/b
$ hg status -C
M d1/b
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
overwriting with renames (issue1959)
$ hg rename d1/a d1/c
$ hg rename d1/b d1/a
$ hg status -C
M d1/a
d1/b
A d1/c
d1/a
R d1/b
$ hg diff --git
diff --git a/d1/a b/d1/a
--- a/d1/a
+++ b/d1/a
@@ -1,1 +1,1 @@
-d1/a
+d1/b
diff --git a/d1/b b/d1/b
deleted file mode 100644
--- a/d1/b
+++ /dev/null
@@ -1,1 +0,0 @@
-d1/b
diff --git a/d1/a b/d1/c
copy from d1/a
copy to d1/c
$ hg update -C
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm d1/c # The file was marked as added, so 'hg update' action was 'forget'
check illegal path components
$ hg rename d1/d11/a1 .hg/foo
abort: path contains illegal component: .hg/foo
[255]
$ hg status -C
$ hg rename d1/d11/a1 ../foo
abort: ../foo not under root '$TESTTMP'
[255]
$ hg status -C
$ mv d1/d11/a1 .hg/foo
$ hg rename --after d1/d11/a1 .hg/foo
abort: path contains illegal component: .hg/foo
[255]
$ hg status -C
! d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm .hg/foo
$ hg rename d1/d11/a1 .hg
abort: path contains illegal component: .hg/a1
[255]
$ hg --config extensions.largefiles= rename d1/d11/a1 .hg
The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !)
abort: path contains illegal component: .hg/a1
[255]
$ hg status -C
$ hg rename d1/d11/a1 ..
abort: ../a1 not under root '$TESTTMP'
[255]
$ hg --config extensions.largefiles= rename d1/d11/a1 ..
The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !)
abort: ../a1 not under root '$TESTTMP'
[255]
$ hg status -C
$ mv d1/d11/a1 .hg
$ hg rename --after d1/d11/a1 .hg
abort: path contains illegal component: .hg/a1
[255]
$ hg status -C
! d1/d11/a1
$ hg update -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm .hg/a1
$ (cd d1/d11; hg rename ../../d2/b ../../.hg/foo)
abort: path contains illegal component: .hg/foo
[255]
$ hg status -C
$ (cd d1/d11; hg rename ../../d2/b ../../../foo)
abort: ../../../foo not under root '$TESTTMP'
[255]
$ hg status -C
check that stat information such as mtime is preserved on rename - it's unclear
whether the `touch` and `stat` commands are portable, so we mimic them using
python. Not all platforms support precision of even one-second granularity, so
we allow a rather generous fudge factor here; 1234567890 is 2009, and the
primary thing we care about is that it's not the machine's current time;
hopefully it's really unlikely for a machine to have such a broken clock that
this test fails. :)
$ mkdir mtime
Create the file (as empty), then update its mtime and atime to be 1234567890.
>>> import os
>>> filename = "mtime/f"
>>> mtime = 1234567890
>>> open(filename, "w").close()
>>> os.utime(filename, (mtime, mtime))
$ hg ci -qAm 'add mtime dir'
"hg cp" does not preserve the mtime, so it should be newer than the 2009
timestamp.
$ hg cp -q mtime mtime_cp
>>> from __future__ import print_function
>>> import os
>>> filename = "mtime_cp/f"
>>> print(os.stat(filename).st_mtime < 1234567999)
False
"hg mv" preserves the mtime, so it should be ~equal to the 2009 timestamp
(modulo some fudge factor due to not every system supporting 1s-level
precision).
$ hg mv -q mtime mtime_mv
>>> from __future__ import print_function
>>> import os
>>> filename = "mtime_mv/f"
>>> print(os.stat(filename).st_mtime < 1234567999)
True